The sublimation materials Unit

Sublimation materials lab photo.

The sublimation materials unit focuses on exploring silicon carbide semiconductors, graphene, other low-dimensional materials, and their energy and environmental applications.

Sublimation materials unit focuses on exploring silicon carbide semiconductors, graphene, other low-dimensional materials, and their energy and environmental applications.

Sublimation materials Unit lab photo.The group is internationally recognized with its expertise in sublimation growth of silicon carbide (SiC) and graphene growth on SiC substrates, particularly the cubic silicon carbide (3C-SiC) growth of bulk like material with high structural quality.

The unique sublimation growth equipment in Sweden is a strong prerequisite of further technological developments. In 2011 the spin off company Graphensic AB for production of high-quality, wafer-scale graphene on SiC substrates was launched.

The group also focuses on exploring graphene, 3C-SiC, and other materials for a direct conversion of solar energy into the renewable energy such as hydrogen and other chemical fuels based on photocatalytic and photoelectrochemical (PEC) water splitting and PEC CO2 reduction. It also aims to tailor material properties for novel sensing, catalysis, and optoelectronic applications. 

Publications

2024

Nerijus Armakavicius, Philipp Kuhne, Alexis Papamichail, Hengfang Zhang, Sean Robert Knight, Axel Persson, Vallery Stanishev, Jr-Tai Chen, Plamen Paskov, Mathias Schubert, Vanya Darakchieva (2024) Electronic Properties of Group-III Nitride Semiconductors and Device Structures Probed by THz Optical Hall Effect Materials, Vol. 17, Article 3343 (Article in journal) Continue to DOI
Septia Kholimatussadiah, Chia-Ling Hsu, Shang -Wei Ke, Tsu-Chin Chou, Yung-Fu Wu, Rositsa Yakimova, Akichika Kumatani, Kuei-Hsien Chen, Li-Chyong Chen, He-Yun Du (2024) In-situ observation of hydrogen nanobubbles formation on graphene surface by AFM-SECM Electrochimica Acta, Vol. 493, Article 144425 (Article in journal) Continue to DOI
Hui Zeng, Jui-Che Chang, Yuanju Qu, Weimin Wang, Jens Birch, Ching-Lien Hsiao, Jianwu Sun (2024) Interface-Engineered InAlN/Cu2O Photocathode with Accelerated Charge Separation for Boosting Photoelectrochemical Water Splitting Solar RRL (Article in journal) Continue to DOI
Daniela Gogova-Petrova, Dat Tran, Vallery Stanishev, Valdas Jokubavicius, L. Vines, M. Schubert, Rositsa Yakimova, Plamen Paskov, Vanya Darakchieva (2024) High crystalline quality homoepitaxial Si-doped β-Ga2O3(010) layers with reduced structural anisotropy grown by hot-wall MOCVD Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, Vol. 42, Article 022708 (Article in journal) Continue to DOI
Nerijus Armakavicius, Sean Robert Knight, Philipp Kuhne, Vallery Stanishev, Dat Tran, Steffen Richter, Alexis Papamichail, Megan Stokey, Preston Sorensen, Ufuk Kilic, Mathias Schubert, Plamen P. Paskov, Vanya Darakchieva (2024) Electron effective mass in GaN revisited: New insights from terahertz and mid-infrared optical Hall effect APL Materials, Vol. 12, Article 021114 (Article in journal) Continue to DOI
Sean Robert Knight, Steffen Richter, Alexis Papamichail, Megan Stokey, Rafal Korlacki, Vallery Stanishev, Philipp Kuhne, Mathias Schubert, Vanya Darakchieva (2024) Terahertz permittivity parameters of monoclinic single crystal lutetium oxyorthosilicate Applied Physics Letters, Vol. 124, Article 032101 (Article in journal) Continue to DOI
Yuanju Qu, Mohammed M. Gomaa, Mohamed H. Sayed, Mostafa Boshta, Grzegorz Greczynski, Rositsa Yakimova, Jianwu W. Sun (2024) A Comparative Study of NiCo2O4, NiO, and Co3O4 Electrocatalysts Synthesized by a Facile Spray Pyrolysis For Electrochemical Water Oxidation Advanced Materials Interfaces, Vol. 11, Article 2300920 (Article in journal) Continue to DOI
Chaoyang Kuang, Shangzhi Chen, Min Luo, Qilun Zhang, Xiao Sun, Shaobo Han, Qingqing Wang, Vallery Stanishev, Vanya Darakchieva, Reverant Crispin, Mats Fahlman, Dan Zhao, Qiye Wen, Magnus Jonsson (2024) Switchable Broadband Terahertz Absorbers Based on Conducting Polymer-Cellulose Aerogels Advanced Science, Vol. 11, Article 2305898 (Article in journal) Continue to DOI

2023

Sean Robert Knight, Steffen Richter, Alexis Papamichail, Philipp Kuhne, Nerijus Armakavicius, Shiqi Guo, Axel R. Persson, Vallery Stanishev, Viktor Rindert, Per O. Å. Persson, Plamen P. Paskov, Mathias Schubert, Vanya Darakchieva (2023) Room temperature two-dimensional electron gas scattering time, effective mass, and mobility parameters in AlxGa1−xN/GaN heterostructures (0.07 ≤ x ≤ 0.42) Journal of Applied Physics, Vol. 134, Article 185701 (Article in journal) Continue to DOI
Alexis Papamichail, Axel Persson, Steffen Richter, Philipp Kuhne, Vallery Stanishev, Per O A Persson, R. Ferrand-Drake Del Castillo, M. Thorsell, H. Hjelmgren, Plamen Paskov, N. Rorsman, Vanya Darakchieva (2023) Tuning composition in graded AlGaN channel HEMTs toward improved linearity for low-noise radio-frequency amplifiers Applied Physics Letters, Vol. 122, Article 153501 (Article in journal) Continue to DOI

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